Color canceling marking systems
AssigneeRohm and Haas Company
InventorsMichael R. Friswell, Al Zimin, Sr., Peter A. Caputo
Life of this patent
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Abstract
Two or more dyes or markers, including a dye or marker having an absorbance peak in the 400 to 500 nm range and including a dye or marker having an absorbance peak in the 560 to 700 nm range are mixed together in appropriate ratios so when added to a liquid, such as a petroleum fuel, at combined levels of from 5 to 100 ppm, the colors of the dyes and/or markers cancel each other such that a “water-white” liquid still appears “water-white”.
Claims11
A mixture of at least a first colored component and a second colored component blended at such ratio that said mixture dissolved in a colorless liquid at between 5 and 100 ppm does not impart color to said colorless liquid due to color canceling of color factors in the components of said mixture.
A mixture of at least a first colored component and a second colored component blended at such ratio that said mixture dissolved in a colorless liquid at between 5 and 100 ppm does not impart color to said colorless liquid due to color canceling of color factors in the components of said mixture;
- wherein said mixture is soluble in a petroleum fuel;
- wherein one of said components is extractable from a liquid in which it is dissolved in a manner which does not extract other components of said mixture;
- wherein one of said components is extractable in alkaline aqueous solution;
- and
- wherein one of said components is a non-extractable dye.
Dependencies are inferred from the claim text.